Sam Thayer has given permission to share this chart. It is found on page 360 of his Nature's Garden. You might need to zoom in to read it.
New to Detroit. Looking to help out with current permaculture and urban farming projects. Here is my blog from when I was an urban homesteader in Ohio but I am continuing to post about our suburban adventures in Permaculture. http://crunchymamasurbanhomestead.wordpress.com/
Companion Planting Guide by World Permaculture Association